Ray and Sal are two orphan sisters that dream of having a dog and a family. While playing near the side of the road a mysterious van stops with a flat tire. The van is stuffed with stolen goods including valuable artworks. The burglars, Kosh and Wesley discover a stowaway, Great Dane puppy. They ...

Moving to New York City brings excitement and challenges for Ray, Sal, and Chestnut. Their apartment has a strict No-Pets allowed sign on the front door, and to make matters worse the girl's new Dad (Matt) is allergic to dogs, forcing the girls to keep their secret, Chestnut hidden. Chaos ensues ...

As Chestnut grows quickly, keeping him hidden becomes impossible. Rosamaria discovers him but agrees to help keep the secret, even sneaking him to the park while the girls are at school. Meanwhile, Kosh and Wesley unknowingly target the wrong apartment, but Chestnut scares them off in the night. ...

The Hero of Central Park With Sal and Chestnut missing, the family launches a desperate search across the city. Ray’s heartfelt plea at an amphitheater helps Sal find her way back, but not before Sal shoos Chestnut away again, hoping to spare him from being sent to the pound. Meanwhile, Kosh and ...